Speed Distance Time Calculator — Find the Missing Value
Result
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Conversions
Formula
Speed Distance Time
D = S x T. S = D/T. T = D/S. Enter two to find the third.
Supports mph, km/h, m/s; miles, km, meters. Time as h/m/s.
Example: 150 mi at 60 mph = 2h 30m. Useful for trips, running, physics.
Frequently Asked Questions
How do I calculate travel time?
Divide distance by speed. 200 miles at 65 mph = about 3 hours 5 minutes.
How to convert mph to km/h?
Multiply mph by 1.609. Quick math: multiply by 1.6. So 60 mph is about 96 km/h.
Speed vs velocity?
Speed is scalar (no direction). Velocity is vector (includes direction). This calculator uses them interchangeably.
How to find average speed?
Total distance divided by total time. 100 miles in 2 hours = 50 mph average.